Sahih Muslim Book - 13, Hadith - 2520

حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ أَخْبَرَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا مَعْمَرٌ عَنِ الزُّهْرِىِّ أَنَّ النَّبِىَّ -صلى الله عليه وسلم- أَقْسَمَ أَنْ لاَ يَدْخُلَ عَلَى أَزْوَاجِهِ شَهْرًا - قَالَ الزُّهْرِىُّ - فَأَخْبَرَنِى عُرْوَةُ عَنْ عَائِشَةَ - رضى الله عنها - قَالَتْ لَمَّا مَضَتْ تِسْعٌ وَعِشْرُونَ لَيْلَةً أَعُدُّهُنَّ دَخَلَ عَلَىَّ رَسُولُ اللَّهِ -صلى الله عليه وسلم- - قَالَتْ بَدَأَ بِى - فَقُلْتُ يَا رَسُولَ اللَّهِ إِنَّكَ أَقْسَمْتَ أَنْ لاَ تَدْخُلَ عَلَيْنَا شَهْرًا وَإِنَّكَ دَخَلْتَ مِنْ تِسْعٍ وَعِشْرِينَ أَعُدُّهُنَّ فَقَالَ « إِنَّ الشَّهْرَ تِسْعٌ وَعِشْرُونَ ».

It was narrated from Az-Zuhri that the Prophet (SAW) swore not to enter upon his wives for a month. Az-Zuhri said: “Urwah informed me that the Aishah [May Allah be pleased with her] said: ‘When twenty-nine days had passed, which I had counted, the Messenger of Allah (SAW) entered upon me. He started with me. I said: ‘O Messenger of Allah! You swore that you would not enter upon us for a month, and now you have entered after twenty-nine days which I have counted.’ He said: ‘The month may be twenty-nine days.’’”